Hi Jorge, both 0.9 and 2 versions are still in active development. 0.9 is mainly maintainance. v2 is useful "as is" but not yet functionaly complete.
picking a few bits off the roadmap for v2 (I should update the wiki now but the syntax is too clunky for a quick fix..):
spatial relationships - done - delegates to NTS v2.11 (a port of JTS)
updateable providers - done - could change in the future as we may try to get rid of the reliance on IDataRecord and move to a more ORMable design
updates to rendering - in progress - currently experimenting with additional renderers including cairo and direct2d
indexing - vector only so far
data provider interface - done - GeoAPI interfaces are shared between SharpMap , ProjNet, NTS, there is also work being done on porting Proj4J to .Net and this is likely to be incorporated too
Code coverage is not as high as it could be...